Bond Work Index Calculation Mill Efficiency Russia

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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 mm 6 mesh to product size in the range of 45150 µm 325100 mesh thus determining the ball mill work index Wi B or BWi The work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the material size of

The work index W i was defined by F Bond as the specific energy kWhton required to reduce a particulate material from infinite grain size to 100 microns The calculation is based on the sizeenergy relationship 12 21 11 nn eC x which for n 05 x 1 ∞ and x 2 100 by definition gives e ∞100 W i and consequently C 10 W i

Bond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills Various correction factors may have to be applied The test is a closedcircuit dry grindability test performed in a standard rod mill

PDF The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test Its value Find read and cite all the research you need

The standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 335mm and size a representative sample The test then involves a series of batch grinds in a standard Bond mill A Bond mill is 0305m by 0305m with rounded corners a smooth lining and runs at 70rpm

Circuit Work Index Efficiency Inverse of Rowland’s WIeff Ore WI lab WIo This value represents the efficiency of the plant circuit compared to the Bond Standard circuit efficiency of 100 no correction factors 100 poor 100Bond Standard 100 good 7 Bond Standard Circuit No Correction Factors • Crushing in closed circuit with screens

According to the Bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250 circulating load Bond 1949 1952 1961 The test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3327 mm

The corrected ball mill operating work index using this method is 133kWht which is close to the Bond ball mill work index of the ore 134kWht which can be backcalculated from the corrected ball mill operating work index by rearranging the Bond formula 11

Bond Ball Mill Work Index BWi kWht 134 Bond Rod Mill Work Index RWi kWht 181 Table 1 Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a

Jan 01 2016 · The Bond Efficiency SubCommittee of the Industrial Comminution Efficiency work group of GMSG has produced such a guideline which follows It covers the methods and provides examples of how to calculate the Bond Work Index Efficiency of most industrial grinding circuits Bond Work Index testing equipment and methods are also provided

Calculation of energy required for grinding in a ball mill Int J Miner Process 25 4146 The Bond work index Wi as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product

Oct 19 2017 · Bond formula for the grinding balls size calculation October 19 2017 · Archive · 0 The enterprises consumers grinding media have a question about right choise the grinding ball size diameter for the mill in order to achieve the required grinding quality

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits Sample Requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 335 mm as required for the Bond Ball Mill Work Index test feed

Drop Weight Index DWi and the coarse ore grinding index M ia Test data from the Bond ball mill work index test is used to calculate the fine grinding index M ib The M ia and M ib indices are used to calculate specific energy for the coarse W a and fine W b components of the total grinding specific energy at the pinion W

Nov 18 2014 · Test design Slide 13 Effect of circulating load on Bonds work index The follow figures shown variation in the Bond work index with test sieve size as test results7 Variation of Bond work index with circulating load CL 100 14

A comparison of wear rates of ball mill grinding Journal of Mining and Metallurgy 52 A 1 2016 1 10 Corresponding author ic

83 Centrifugal force outward Fc mp 2 Dm 2 81 is the angular velocity mp is the mass of any particle media or charge in the mill and Dm is the diameter of the mill inside the liners Gravitational force Fg mpg 82 The particle will remain against the wall if these two forces are in balance ie

Wiopc denote Bond efficiency factor Laboratory Bond index kwht and corrected operating Bond index kwht respectively Bond efficiency factor values of more than 100 means that the mill consumes less than the laboratory Bond tests estimate and therefore the throughput can be increased

Jul 31 2014 · As the cement size is in this size range it could be concluded that the Barmac crusher produces a significant amount of finely ground cement Table 1 Bond method power calculation for twocompartment mill Mill feed F80 mm EF4 Power required kW Difference 155 106 3564 00 45 101 3251 88 30 1 3133 121 18 1 3018 153 It can be

Bonds law is often written in terms of the work index Wi as Where the work index is defined as the energy required per unit mass in kWhton to reduce an infinitely large particles to D80 100 μm In the above equation unit of D80 is in mm of ‘W’ is kWh and of ‘m’ is in ton Work index for common materials is Material Wi kWhton

Calculation of the power draw of dry multicompartment ball mills 225 The mill load that is the volume of charge in the mill is the principal determinant of power draw Estimation of the ball load that is mixed with the cement charge is difficult and can be highly erroneous So direct measurement must be taken for calculation of mill load

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screened and the index determined from the size analysis curves 25 Work Index Determination The asreceived samples were prepared to all passing 335 mm The 106 µm particles were also removed and analysis was conducted on the 335 mm 106 µm material The tests were performed in a standard Bond ball mill with weight of material

Dec 18 2013 · For P80s finer than 75 μm the Levin test a modified Bond ball mill work index test may be used to predict grinding performance Signature Plots No general work index formula governing energy use over a range of conditions like the Bond equation for intermediate grinding has yet been found for the fine grinding regime

assumed feed passing size varied from 5mm to 25mm The work index WI used was 14kWht for the CFRP according to the Typical Bond Index value For each test the power draw is determined by the calculation software designed by the Smart Dog Mining Company who developed the software from information gathered over 40 years in the mining industry

Bonds law is often written in terms of the work index Wi as Where the work index is defined as the energy required per unit mass in kWhton to reduce an infinitely large particles to D80 100 μm In the above equation unit of D80 is in mm of ‘W’ is kWh and of ‘m’ is in ton Work index for common materials is Material Wi kWhton

Oct 01 2015 · Five interchangeable metrics have been used including kWht bond work index and size specific energy The generation of new 75 µm material is used to calculate the Size Specific Energy SSE which has been previously been demonstrated to be a practical and fair measure of energy efficiency

The Bond ball mill grindability test measures hardness as an index regardless of the feed size so it does not give credit for the additional fines Therefore the index itself is ignored in the analysis and the results are assessed in terms of throughput rate or specific energy requirement

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To calculate operator efficiency the standard minutes SAM of the garment will be needed According to Online Clothing Study the following formula is used to calculate operator efficiency Efficiency Calculation formula Efficiency Total minute produced by

coefficient of reduction the work index of the material the mill shaft power and the specific gravity of the material These parameters are thoroughly studied in 4 5 and an empirical relation is suggested expressing the mill capacity as a ratio of the mill shaft power and

Steel rolled in twostand reversing cold mills is suitable for a wide range of applications offering the best possible performance in terms of quality and productivity A twostand reversing cold mill can deliver capacities between 300000 ta of thingauge products or 1000000 ta

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3 To calculate the overall efficiency of the cyclone separator 4 To find mixing index 5 To determine Critical index Work Index Bond’s Law Rittinger’s Law and Kick’s Law for Ball mill 6 To determine the scr een efficiency for the given sample 7 To determine Rittinger’s constant Bond’s constant Kick’s constant and Work Index